[Csharp] Address MaxTimeout obsolete build warning · OpenAPITools/openapi-generator@a350a6f

Build: samples/client/petstore/csharp/generichost/standard2.0/Petstore/src/Org.OpenAPITools/Model/ObjectWithDeprecatedFields.cs#L120

'ObjectWithDeprecatedFields.Bars' is obsolete

Build: samples/client/petstore/csharp/generichost/standard2.0/Petstore/src/Org.OpenAPITools/Model/ObjectWithDeprecatedFields.cs#L121

'ObjectWithDeprecatedFields.DeprecatedRef' is obsolete

Build: samples/client/petstore/csharp/generichost/standard2.0/Petstore/src/Org.OpenAPITools/Model/ObjectWithDeprecatedFields.cs#L122

'ObjectWithDeprecatedFields.Id' is obsolete

Build: samples/client/petstore/csharp/generichost/standard2.0/Petstore/src/Org.OpenAPITools/Model/ObjectWithDeprecatedFields.cs#L242

'ObjectWithDeprecatedFields.Bars' is obsolete

Build: samples/client/petstore/csharp/generichost/standard2.0/Petstore/src/Org.OpenAPITools/Model/ObjectWithDeprecatedFields.cs#L243

'ObjectWithDeprecatedFields.Bars' is obsolete

Build: samples/client/petstore/csharp/generichost/standard2.0/Petstore/src/Org.OpenAPITools/Model/ObjectWithDeprecatedFields.cs#L245

'ObjectWithDeprecatedFields.DeprecatedRef' is obsolete

Build: samples/client/petstore/csharp/generichost/standard2.0/Petstore/src/Org.OpenAPITools/Model/ObjectWithDeprecatedFields.cs#L246

'ObjectWithDeprecatedFields.DeprecatedRef' is obsolete

Build: samples/client/petstore/csharp/generichost/standard2.0/Petstore/src/Org.OpenAPITools/Model/ObjectWithDeprecatedFields.cs#L254

'ObjectWithDeprecatedFields.Bars' is obsolete

Build: samples/client/petstore/csharp/generichost/standard2.0/Petstore/src/Org.OpenAPITools/Model/ObjectWithDeprecatedFields.cs#L259

'ObjectWithDeprecatedFields.DeprecatedRef' is obsolete

Build: samples/client/petstore/csharp/generichost/standard2.0/Petstore/src/Org.OpenAPITools.Test/Api/PetApiTests.cs#L93

'IPetApi.FindPetsByTagsAsync(List<string>, CancellationToken)' is obsolete

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